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WS-C3850-12XS-S
Cisco WS-C3850-12XS-S Catalyst 3850 12-Port 10 Gigabit Fiber...
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WS-C3850-12XS-S provides 12 fixed 1/10G SFP+ interfaces in a managed Layer 3 fiber switch with the IP Base feature set. The modular uplink bay accepts C3850-NM-4-10G, but the base configuration does not include that module. This Rack-Mount 1U model belongs to the Cisco Catalyst 3850 family and can aggregate smaller access switches over fiber connections, including deployments sensitive to electromagnetic interference. The chassis supplies no PoE output, so connected equipment requires independent power. The discontinued WS-C3850-12XS-E carries IP Services instead of IP Base on the same fixed-port configuration; that distinction matters when an existing configuration requires advanced routing rather than routed access.
WS-C3850-12XS-S price for new stock is $1,674.75, a 94.2% saving from the Cisco list price of $28,808.00. WS-C3850-12XS-S refurb price is $409.50. WS-C3850-12XS-S is in stock and available for free next-day delivery. (terms applied)
Request bulk order quote for WS-C3850-12XS-S for additional pricing. Browse the full Cisco 3850 Catalyst Switches series or explore all Cisco products.
320 Gbps switching capacity and 227.28 Mpps forwarding rate characterize the switching hardware. Static routing, RIPv1, RIPv2, RIPng, EIGRP Stub, OSPF for routed access and PBR are included with IP Base; full OSPF, BGPv4, IS-ISv4 and PIM require IP Services. The 24000-entry IPv4 total includes ARP entries and learned routes, rather than representing an OSPF license allowance. WS-C3850-12XS-S carries 4 GB DRAM and 4 GB flash, while its MAC table accommodates 32000 entries. StackWise-480 stacks nine members and provides 480 Gbps stacking bandwidth for inter-member traffic. Three C3850-FAN-T1= fans provide redundant cooling. A published 112.7W consumption figure includes C3850-NM-4-10G, which makes that configuration relevant when sizing electrical load. CLI access, Cisco Prime Infrastructure and SNMP support configuration and monitoring; SSH and SNMPv3 require a cryptographic software image.
WS-C3850-12XS-S is offered new sealed or certified refurbished; refurbished units are inspected and bench-tested for power-on and POST, every port linking at rated speed, clean boot, optics and module-bay recognition, stack adapter negotiation, and PSU and fan status, with firmware verified and configuration wiped to factory default. Specify condition, C3850-NM-4-10G and optics on the order as required. ORM warranties are up to 3-year extended for new units and up to 1 year for certified refurbished units; returns are 30 days on every condition, terms apply; Cisco's original-owner Enhanced Limited Lifetime warranty is bounded by April 30, 2027. Enterprise and volume orders support PO acceptance, government Net-30 and RMA with advance replacement.
| Key Specs | Key Spec Values |
|---|---|
Operating System | Cisco IOS XE |
License Tier | IP Base |
Port Configuration | 12 x 1/10G SFP+ / Empty modular uplink bay |
Stacking | StackWise-480 / Nine members. |
Lifecycle Status | End of sale April 30, 2022 |
Replacement PID | C9300X-12Y. |
In high-frequency trading environments where every microsecond counts, the WS-C3850-12XS-S Cisco Catalyst 3850 12 Port 10G Fiber Switch IP Base acts as a dedicated ultra-low-latency backbone. Deployed between trading servers, market data feeds, and order-management systems, it delivers deterministic forwarding, hardware-based QoS, and wire-speed 10G fiber connectivity. The outcome is reduced packet-processing delay, prioritized mission-critical traffic and measurable gains in trade execution speed, enabling firms to outpace competitors and mitigate market risk.
In large corporate and university campuses requiring robust, future-proof distribution layers, the WS-C3850-12XS-S provides 12 dedicated 10G SFP+ fiber uplinks to aggregate multiple access switches. It integrates seamlessly with Cisco DNA Center for policy-driven automation and advanced security enforcement. The switch’s high-density 10G ports and IP Base feature set ensure non-stop campus-wide connectivity, simplify network operations, and support skyrocketing bandwidth demands from cloud applications, video collaboration and IoT deployments.
In mid-size data centers requiring cost-effective Top-of-Rack (ToR) aggregation, the WS-C3850-12XS-S delivers 12 10G fiber links to servers, storage arrays and spine switches. With extensive multicast support, VLAN segmentation and advanced security features in the IP Base image, it streamlines traffic consolidation, reduces cabling complexity and enforces east-west segmentation. The result is a simplified architecture with predictable 10G performance, improved fault isolation and lower operational overhead for dynamic virtualization and software-defined workloads.
When an installed fleet needs a matching WS-C3850-12XS-S spare, align the replacement with the existing configuration and accessory inventory rather than ordering a chassis alone. ORM provides regional stock and RMA coverage across the UK, EU, US and MEA; specify condition, accessory quantities and the receiving region on the PO.
When a branch standardization project includes SD-Access segmentation, IP Base with Cisco DNA Advantage is limited to three virtual networks. Count the required segmentation domains separately from physical connections, and identify the base entitlement and add-on scope before approving the software and hardware lines on the PO.
When equipment is staged in an unheated room before deployment, the minimum ambient temperature for a cold start is 0°C. Treat startup temperature separately from the operating range once the unit is running, and confirm the staging environment and commissioning procedure before releasing the PO.
40G or 100G module uplinks
WS-C3850-12XS-S accepts C3850-NM-4-10G only; the permitted uplink module provides neither 40G nor 100G interfaces. A different module cannot satisfy either speed requirement on this chassis.
Full BGP or multicast routing
IP Base excludes BGPv4 and PIM routing; both require IP Services. The supplied entitlement therefore does not satisfy a configuration requiring those advanced routing capabilities.
Cisco support beyond April 2027
Cisco support ends April 30, 2027. C9300X-12Y is the named successor for migration planning, rather than a means of extending support for the older chassis.
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| WS-C3850-12XS-S |  WS-C3850-48T-L |  WS-C3850-48XS-F-S |  WS-C3850-48P-S | |
|---|---|---|---|---|
| Depth | 450 mm | 450 mm | 511 mm | 450 mm |
| Ethernet Technology | 10 Gigabit Ethernet | Gigabit Ethernet | 10 Gigabit Ethernet | Gigabit Ethernet |
| Flash Memory | 4 GB | 2 GB | 8 GB | 2 GB |
| Form Factor | Rack-Mount 1U | Rack-Mount 1U | Rack-Mount 1U | Rack-Mount 1U |
| Height | 44.5 mm | 44.5 mm | 44.5 mm | 44.5 mm |
| Manufacturer Part Number | WS-C3850-12XS-S | WS-C3850-48T-L | WS-C3850-48XS-F-S | WS-C3850-48P-S |
| Memory | 4 GB | 4 GB | 8 GB | 4 GB |
| Power Consumption | 112.7W with C3850-NM-4-10G | 127.24W with C3850-NM-4-10G | 288.1W | 715W |
| Switching Capacity | 320 Gbps | 176 Gbps | 1280 Gbps | 176 Gbps |
| Weight | 5.8 kg. | 7.7 kg | 7.45 kg | 7.9 kg |
| Width | 445 mm | 445 mm | 445 mm | 445 mm |
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New products are backed by up to 3 years of extended warranty, and certified refurbished units by up to 90 days, for dependable protection on every order. The exact term is confirmed on your quote, order confirmation and invoice.
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Every device is inspected, bench-tested, and firmware-verified, with configurations wiped before dispatch. Additional testing can be arranged to confirm full working condition on request.
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Reviewed on the 18 June 2023
Cisco build quality with predictable performance.
Reviewed on the 15 April 2018
Strong option for compact 10G access.
Reviewed on the 6 August 2024
10G fiber ports provided excellent speed and consistency.
Reviewed on the 29 December 2025
Reliable access switch for high-speed connectivity.
Reviewed on the 20 March 2018
Handled sustained traffic without issues.
WS-C3850-12XS-S identifies a Catalyst 3850 switch with 12 SFP+ Ethernet ports and IP Base: WS-C3850 is the series prefix, 12 is the port count, XS identifies the SFP+ configuration, and the final S selects IP Base. The stackable 1U configuration includes PWR-C1-350WAC.
WS-C3850-12XS-S is managed through the Cisco IOS XE CLI, including console access and remote SSH or Telnet sessions, with Cisco Prime Infrastructure for centralized operation and SNMP for monitoring. SSH and SNMPv3 require a cryptographic software image; specify the intended management image and access configuration before commissioning.
WS-C3850-12XS-S reached end of sale on April 30, 2022, and its last date of Cisco support is April 30, 2027. New service attachment ended April 30, 2023, and contract renewal ended July 29, 2026. C9300X-12Y is the named migration target for this discontinued model.
ORM offers WS-C3850-12XS-S new sealed or certified refurbished, with up to 3-year extended warranty for new units and up to 1 year for refurbished units. Returns are 30 days on every condition; terms apply. Cisco's original-owner Enhanced Limited Lifetime warranty is bounded by the April 30, 2027 support deadline.
WS-C3850-12XS-S includes IP Base; IP Services uses RTU activation, and optional Cisco DNA Essentials or Cisco DNA Advantage add-ons start at three years. Cisco DNA Premier bundles were also offered. Base and add-on entitlements are separate; after add-on expiration, renew or deactivate and reload to continue with base capabilities.
WS-C3850-12XS-S supports C3850-NM-4-10G, providing four 1G or four 10G uplink interfaces, but the base configuration does not include that module. C3850-NM-4-1G and C3850-NM-2-10G are unsupported on this 12-port SFP+ chassis. Order C3850-NM-4-10G and compatible optics together when additional uplinks are required.
WS-C3850-12XS-S includes one PWR-C1-350WAC and an empty second power-supply bay; internal redundancy is optional rather than standard. Input is 100-240V AC. The 350W rating belongs to PWR-C1-350WAC, not the chassis draw; published consumption reaches 112.7W with C3850-NM-4-10G installed.
StackWise-480 stacks nine Catalyst 3850 members with 480 Gbps stacking bandwidth. WS-C3850-12XS-S requires consistent software feature sets across members; LAN Base cannot be mixed with IP Base or IP Services. Data-cabling options are STACK-T1-50CM=, STACK-T1-1M= and STACK-T1-3M=, selected for the physical rack layout.
The Catalyst 3850 IP Base configuration supports static routing, RIPv1, RIPv2, RIPng, EIGRP Stub and OSPF for routed access, together with PBR. Full OSPF, EIGRP, BGPv4, IS-ISv4 and PIM require IP Services. Match the planned routing scope to the included feature set before staging the configuration.
WS-C3850-12XS-S carries IP Base, while WS-C3850-12XS-E carries IP Services on the same 12-port SFP+ configuration. Both variants are discontinued. The S configuration suits routed-access requirements within IP Base; the E configuration suits legacy deployments requiring full OSPF, EIGRP, BGPv4, IS-ISv4 or PIM.
WS-C3850-12XS-S leaves its uplink bay empty, whereas discontinued WS-C3850-16XS-S includes C3850-NM-4-10G with the same 12 fixed SFP+ ports and IP Base feature set. The unbundled model suits an existing module inventory; the 16XS bundle suits a legacy order requiring four additional 10G uplink ports.
WS-C3850-12XS-S is discontinued, and C9300X-12Y is its named migration target rather than another Catalyst 3850 variant. The older chassis suits matching-spare purchases within its remaining support window; C9300X-12Y is the successor for buyers planning migration, with the replacement's software entitlement and accessory requirements specified separately.
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